System for transmitting the scrambled broadcast-signals in single frequency network, and a method thereof

A system for transmitting encrypted broadcast signals on a single frequency network (SFN) for terrestrial and satellite digital broadcasting, comprising:

• a main broadcasting unit comprising a hardware processor configured to transmit the encrypted broadcast signals including data streams and transmitter identification information (TII) of the main broadcasting unit through a main broadcasting network;
• a repeating unit comprising a hardware processor configured to:
• amplify the encrypted broadcast signals of the main broadcasting network and transmit the amplified encrypted broadcast signals, and
• modulate and amplify the data streams input by the main broadcasting unit through a private line and repeat the encrypted broadcast signals of the main broadcasting unit through a repeating network:
• a decrypting key provider comprising a hardware processor configured to:
• receive a decrypting key value from at least one of the main broadcasting unit and the repeating unit, and
• transmit a user authentication and decrypting key to a charged subscriber terminal through a mobile communication network,
• wherein the TII of the main broadcasting unit is included in the encrypted broadcast signals transmitted from the main broadcasting unit and is used to decrypt the encrypted broadcast signals received by a subscriber terminal on the main broadcasting network,
• wherein a repeating system TII value of the repeating unit is included in the encrypted broadcast signals transmitted from the repeating unit and is used to decrypt the encrypted broadcast signals received in a subscriber terminal on the repeating network,
• wherein the repeating unit is configured to allocate the repeating unit TII value, which is different from the TII of the main broadcasting unit, and transmits the repeating unit TII value when repeating at least one of the data streams.